Critical Temperature For Heating Spring Steel
Critical Temperature For Heating Spring Steel
(OP)
We have a coil spring made of 5160H alloy steel. In our shop we powder coat the spring, which it is held at 400*F for roughly 25 minutes. We have been experiencing some spring breakage and one thought was we used to paint the spring and bake it at 400*F for 5 minutes. There were some other changes made at this time as well, but one thought was that there could be a metallurgical process that is causing breakage. I have looked briefly for a phase diagram for this alloy but have not found anything. Would this temperature/time exposure cause any significant changes to the material properties? The spring sees a great deal of bending force as it is not used in a conventional linear fashion.
Thanks,
Christian
Thanks,
Christian





RE: Critical Temperature For Heating Spring Steel
RE: Critical Temperature For Heating Spring Steel
RE: Critical Temperature For Heating Spring Steel
Have you had the spring failures subjected to a proper failure analysis by a metallurgical lab? I would start with this approach because otherwise you are simply guessing.
RE: Critical Temperature For Heating Spring Steel
RE: Critical Temperature For Heating Spring Steel
RE: Critical Temperature For Heating Spring Steel
At my place of employment we hot coil this alloy into springs,
they are quenched and then tempered. We aim for a hardness
of RC 42-48.
I know of many of these Rocking Horse applications where 'someone'
has tried to weld the Spring Steel to the Base Plate.
Not so good. Best Spring designs have the ends with a partially
open pitch. One end latches to the underside of the horse,
the other end latches into the base plate.
RE: Critical Temperature For Heating Spring Steel
RE: Critical Temperature For Heating Spring Steel